Attachment for ejectors of die-presses or like machines.



0; n.- McDONAL-Da ATTACHMENT FOR EJECTORS 0F DIEPRE SSES OR LIKE MACHINES, APPLICATION FILED FEB. 23. 1987:

$350 Emma 001;. 16, 1917.

3 SHEETSSHEET I;

BY J

C. D. McDONALD.

ATTACHMENT'FOR EJECTORS 0F DIE PRESSES 0R LIKE MACHINES.

APPUCATION FILED FEB. 23. I917- Patented Oct. 16, 1917.

'LQQBA35Q 3 SHEETS-SHEET 2.

" NVENTOR. .M DOnaZcZ.

BY Z

' ATTORNEY WI T N E55 7 C. D. MCDONALD.

ATTACHMENT FOR EJECTORS 0F DIE PRESSES 0R LIKE MACHINES.

APPLICATION FILED FEB. 23. 1917.

Patented Oct. 16, 1917.

3 SHEETS-SHEET 3.

W1 TNESS @M ATTORNEY whereby whenthe ejector encounters an abpower from the ower shaft.

CHARLES 1D. MoDONALD, OF CHICAGO, ILLINOIS.

ATTACHMENT FOB'EJECTOBS 0F DIE-PRESSES OR LIKE MACHINES.

Specification of Letters Patent.

Patented 0ct. I6, 1917.

Application filed February 23, 1917. Serial in. 150,446.

. 0 To all whom it may concern Be it known that I, CHARLES D. McDon- ALD a citizen of the United States, residing at hicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Attachments for Ejectors of Die-Presses or like Machines, of which the following is a specification.

The present invention relates to a certain appliance or attachment adapted tobe used in connection with ejectors of die-presses or like machines, whereby when the ejector is prevented from performing its ejecting action, the power'will be automatically cut 0E from the power shaft of the press and the entire press mechanism brought to a stand-still.

' One object of the invention is to provide to throw certain mechanism and cut oif the' supply of power from the power shaft, whereby the entire mechanism is stopped. A further object of the invention is to provide tension or similar means which will,

act to prevent operation of the appliance that cuts ofi the power when the normal pressure is exerted on-the ejector during its ejecting operation, and so insures the power cutting-off appliance being operated only at such times as when the ejector shall encounter an abnormal resistance in carrying out the ejecting operation. I

A further object of the invention is to movably mount the cam-member which moves the ejector in the ejecting operation,

normal resistance, the pressure ofthis resistance will cause the cam-memberto move, and then through a suitable connection, the appliance will be operated to cut oif the A furtherob ect of the provide a connection between ,he cam-member, moved=;:directly by the ejector, and the appliance which cuts oif the supply of power from the main power shaft of the press,

whereby the movement of the cam-member will be amplified in transmission to the apliance which cuts off the supply of power om the power shaft, so that sufiicient pressure will be obtained to actuate the latter invention is to arts without placing any undue strain or pressure upon the ejector when it moves the parts illustrated in Fig. 1, and showing such parts'in the position assumed when the ejector encounters an abnormal resistance to its ejecting operation and has acted to move the cam-member;

Fig. 3, a view of the appliance for cutting oif the supply of power from the power shaft, and with the parts in the position assumed when power is being transmitted to said power shaft and the press in condition for running; 7

Fig. 4, a view'similar to Fig. 3, showing the parts in the position assumed when power is cut off from the power shaft and the action of the press' stopped;

Fig. 5, a detail showing a side view of the connection between the ejector and the crossshaft which operatesthe'applian'ce for cutting off the supply of power from the powershaft Fig. 6, a plan view of the clutch mecha- 1118111 shown;

Fig. 7 a face flyiew of such mechanism; Fig. 8, a deta the clutch-pin and the clutch-pin-actuating' arms; and Y I Fig. 9, a detail showing one of said clutchpin actuating arms.

In the art to which the present invention relates, an ejector is used for forcing the work out of the die after the stamping operation. It happens that, for one reason .or another, the work will become choked in the die tothe extent that the ejector mechanism cannot force it out, or only forces it partly out. If the press continues to operate after the ejector has failed to force the work out from the dieit is. obvious that further choking of the die will result, which oftentimes places a strain upon the mechanism so as to cause serious injury to certain of the working parts. 1 j

It is the-primary object of thepresent inpartly in section, showing vention to provide an appliance or device whereby when the ejector encounters a re sistance to its normal operation, the presence of such resistance will actuate said appliance so as to cut off power from the power shaft and bring the entire press to a stop, thereby eliminating the heretofore-recited objectionable feature of allowing the press to continue in Operation after the die has become choked through failure of the ejector to force the work out therefrom.

Referring now to the drawings, the appliance is shown in connection with a press body 10, which may be of any suitable size or form. A reciprocating die member 11 is shown, and, as illustrated, this die member is actuated by means of a toggle such as is fully shown and described in my co-pending application Serial No. 150,4l5, filed February 23, 1917 and entitled Appliances for die-presses or the like.

' It is, of course, understood that the appliance of the present invention is not intended ltobe limited for use in connection with a press wherein the die is actuated by means of a toggle, and the same is merely shown in order to illustrate one form of press with which the appliance of the present invention is applicable. I

Carried by the reciprocating .slide 1:2 of the die is an ejector 13 in the form of a lever, pivoted upon a pin 14, and comprising an acting end 15, and carrying a roller or similar member 16 at the opposite end. This roller 16 travels along the cam-face 17 of a block 18. The block is held stationary with respect to the up and down movements of the die, and at a certain point in the upward movement of the die, the roller will strike the sloping portion of the cam-face 17, which will cause the ejector to be moved so that the acting end 15 will be forced in a downward direction and eject the work from the die member.

The block 18, in the construction shown, is carried by a frame 19, which is pivotally mounted upon a pin 20. The upper end of the frame is formed with a lug or extension 21 provided with a slot 22, in which extends a limiting pin 23; and bearing against the outer face of this lug 21 is a spring 2% held within a suitable barrel or casing '25. This spring 24 is of sufficient strength so as to prevent the frame 19 from moving when pressure is exerted against the cam-face of the block 18 during the normal operation of the ejector. Obviously, the said cam-face could not act to move the ejector in the ejecting operation unless the block 18 remained stationary. Therefore, the spring 24 is of sutlicient strength so as not to allow the block to move except under abnormal pressure.

Mounted upon the press body, adjacent to the frame 19, is an ear or lug 26 carrying a pin 27, upon which is mounted a bellcrank 28. One end 29 of this crank engages the outer side face of the frame 19. The other end 30 is connected to one end of a link or rod 31, which link or rod extends downwardly and passes through an opening 32 in an arm 33 (see Fig. 5}. A suitable nut or other abutment 34 is provided, whereby the rod 31 makes engagement with the arm 33 upon downward movement of the rod. This arm 33 is keyed, or otherwise secured, to a cross-shaft 35, to the opposite end of which shaft is connected a lever 36 formed with a hand-piece 37. This lever, as shown, is limited in its up and down movements by means of'suitable stops 38.

Connected to the lever 36 by a pin 39 is a link 40, which in turn is connected to a rocking arm 41 and to one side of the pivot i2 for said arm. To the end 13 of this arm ll is connected a link or rod 44, which actuates an expander a5 for brake members as. To the opposite end 47 of the lever 41 is connected a link 48 joined to one end of a bell-crank 49, and the opposite end of said crank is connected to a link 50, joined in turn to a clutch-pin actuating arm 51. This arm is pivoted upon a pin 52, and at its lower end is connected to a link 53, and-this link in turn is joined to the lower end of a clutch-pin actuating arm, which is pivoted at 55'.

These clutch-pin actuating arms each embody a cam or wedge-shaped surface 56 (see Fig. 8), and when thrown inward toward the main power shaft 57, they assume a position whereby they engage in a groove 58 formed in a spring-pressed pin 59, which pin is adapted to enter a recess in a collar 60 joined to a fly-wheel 61. This fiy-wheel is constantly driven, and when the pin is in engagement with the recess in the collar, power is being transmitted through the hub of the fly-wheel to the shaft 57, and when the clutch-pin actuating arms are thrown into position so that the wedge-face 56 engages with the notch in the pin 59, the said pin is pulled outward from the recess in the collar and the connection to the power shaft broken.

Although this form of clutch is desirable with presses in which the die is actuated with toggle mechanism, the particular form of clutch employed is not deemed in any way to be a limitation on the scope of the pres ent invention, since, of course, the present invention may be employed in' connection with clutches of an entirely di fierent character. This particular form of clutch is shown because of the fact that it is especially desirable when a toggle action is em-ff ployed for operating the die. ln stopping the machine, it should aim be brought to rest when the die has .reac i,

the limit of its HP-StIOkG. With thetog-gie form of press, the die will reach this limit of up-stroke twice during each revolution of the power shaft; and by using two arms for actuating the clutch-pin, the power shaft cannot move farther than one-half revolution after the clutch arms are set before the clutch-pin will be engaged. Hence, the

ower will be cut off when the die is atits fimit of up-stroke, which occurs at the end of each half revolution of the power shaft.

The operation briefly is as follows:

Assuming that the ejector 13 encounters a resistance whereby it cannot force the work from the die, such resistance will place a back-pressure upon the ejector, whereby when it encounters the sloping portion of the cam-face 1.7, it will not be forced down, but, rather, the block 18, together with the frame 19, will be pushed back from the ejector against the pressure of the spring 24. This is due to the/pivotal mounting of the frame 19. When so pushed back as in Fig. 2, the bell-crank 28 will. be rocked, pushing downward the rod 31, as shown by dotted lines in Fig. 5, swinging the arm 33 to the dotted line position of Fig. 5, and rocking the cross shaft 35, which will move the lever 36 from the position of Fig. 3 to the position of Fig. 4. This will move up the link 40 and move the rocking arm from the position shown in Fig. 3 to that shown in Fig. 4, actuating the link 44: to move the brake expander 45 and release the brakes to allow them to swing inward into operative position; and the movement of the lever 41 will also move the rod 48, actuating the bellcrank 49, moving the clutch-pin actuating arm 51 inward, and through the instrumentality of the link 53,-swing the clutch-pin actuating arms 51 and 5 1 inward and place both arms in the position of Fig. 4:. When so placed, they will be in position to withdraw the clutch-pin and cut oif the application of power to the power .shaf thus bringing the entire. press mechanism 0 rest and preventing operation of the press after the die has become jammed.

I claim: v V

1. The combination with ejector mecha- 59 nism, of a power shaft, means for controlling the application of power to said shaft, and means actuated by abnormal resistance to the operation of the ejector for operating said means for stopping the application of said power from said power shaft, substantially as described.

2. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft, shiftable means for operating said power controllingmeans, a-jportion of said shiftable means being located adjacent the ejector 'mechanism'and' adaptedto be moved when abnormal resistance to; the operation of the ejector is encountered, said movement shiftable means for operating said power controlling means, a portion of said shiftable means being located adjacent the ejector mechanism and adapted to be moved when abnormal resistance to the operation of the ejector is encountered, said movement of said shiftable means operating said power controlling means to stop the application of power to said. power shaft, and means exerting a counter-pressure upon said shiftable means to prevent movement of the latter during the normal operation of the ejector, substantially as described.

4. The combination with ejector mechanism, of a power shaft, means for controlling the application of. power to said shaft, shiftable means for operating said power controlling means, a portion of said shiftable means being located adjacent the ejector mechanism and adapted to be moved when abnormal resistance to the operation of the ejector is encountered, said movement of said shiftable means operating said power controlling means to stop the application of power to said power shaft, and tension mechanism bearing against said shiftable means and preventing movement of said means during the normal operation of the ejector, substantially as described.

5. The combination with ejector mechanism, of a power shaft, means for controL ling the application of power to said shaft, means for operating said power controlling means comprising'a movable cam member with which the ejector engages, said cammember being moved by pressure exerted on the ejector due to abnormal resistance to its operation, and a connection between said cam-member and the means for controlling the application of power to said power shaft, substantially as described.

6. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft,

means for operating said power controlling means comprising a movable cam-member with which the ejector engages, said cammember being moved by pressure exerted on the ejector due to abnormal resistance to itsoperation, a connection between said cammember and the means for controlling the application of power to said power shaft, and means exerting a counterpressure against said cam-member to prevent its moving during normal operation of the ejector, substantially as described.

7. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft, means for operating said power controlling means comprising a cam-member with which the ejector engages, a pivotal mounting for said cam-member located at one end thereof, said cam-member being moved about its pivot by pressure exerted on the ejector due to abnormal resistance to its operation, tension mechanism located at the opposite end of the cam-member and exerting a counterpressure to prevent movement of the cammember during the normal operation of the ejector, and a connection between the cammember and the means for controlling the application of power to said power shaft, substantially as described.

8. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft, means for operating said power controlling means comprising a lever arm connected to said power controlling means, and means for actuating said lever arm operated by pressure exerted 011 the ejector due to abnormal resistance to the'movements thereoflsubstantially asdescribed.

9. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft, means for operating said power controlling means comprising a rock-shaft, a connection between the rock-shaft and power controlling means tor operating the controlling means by movement of the shaft, and means for moving the shaft actuated by pressure exerted on the ejector due to abnormal resistance to its operation, substantially as described.

10. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft, means for operating said power controlling ran-aces means comprising a rock-shaft, two crank arms connected to said rockshaft, a connection between one of said crank arms and said power controlling means, and means for rocking said shaft to actuate said power controlling means, comprising a member operatively connected to the other crank arms, and said member being moved by pressure exerted on the ejector due to abnormal resistance to its operation, substantially as described. I

11. The combination with ejector mechanism, of a power shaft, means for controlling the application of power to said shaft, means for operating said power controlling means, comprising a shiftable member, and a series of links and levers connecting the shiftable member and power controlling means, said shiftable member being adapted to be moved when abnormal resistance to the operation of the ejector is encountered, and said links and levers serving to movement of the shiftable member in transamplify the mitting such movement to said power application controlling means, substantially as I described.

scribed.

CHARLES D. MCDONALD. 

